X0303 4/A 2011-02-08 2011-02-10 0000066740 3M CO MMM 0001215821 BUCKLEY GEORGE W 3M CENTER ST. PAUL MN 55144-1000 1 1 CHAIRMAN OF THE BOARD & CEO Common Stock 2011-02-08 4 A 0 27647.1 0 A 27647.1 I By Corporation Common Stock 2011-02-08 4 F 0 584 89.47 D 27063.1 I By Corporation On February 10, 2011, the reporting person reported the deferred receipt of a number of shares of 3M Common Stock earned as the result of the 2008 performance shares awarded to such person under the 3M Performance Unit Plan. The number of shares to be withheld for payment of FICA withholding taxes was unknown. This amendment is being filed to update the Form 4 with the number of shares used for FICA withholding, as well as updating the number of shares (4,992.271 shares) in which the reporting person's former spouse has an economic benefit right. The amount reported on February 10, 2011 also reflected a rounded whole number of shares, while the amount actually earned includes a fractional share of stock. This updated Form 4 reflects the shares earned without rounding. Under the terms of the 3M Deferred Compensation Plan, the reporting person elected to defer receipt of these shares which become payable one year after the reporting person retires. There are no voting or investment powers with respect to these shares. George Ann Biros, attorney-in-fact for George W. Buckley 2011-02-23